I tend to agree on placing the shut-off on the suction side of the pump but be careful about restrictions.

Its not a good idea to 'add' restrictions on the suction side, free flowing fuel is the key so the pump can run with stable rpm's at any given turbine rpm, those Festo gate valves are very good but the restriction inside them in terms of the narrowing down of the bore is quite big and this will add restriction to flow and in some installations it might add to problems too.

marcs